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Multiple density helmet body compositions to strengthen helmet
Multiple density helmet body compositions to strengthen helmet
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机译:多种密度头盔主体成分可增强头盔
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摘要
A protective helmet having dome-shaped body means, the combination comprising a retention strap associated with the body means; and a first cavity in the body means in which a substantial length of the strap is stored in position to be pulled out of the cavity for use in retaining the helmet to the head of a user.
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